feat: 提交审核时间 submit_review_time 与审核台 createTime 语义对齐

- 新增 t_ugc_work.submit_review_time，publish/withdraw/revoke 维护
- 内容审核 VO：createTime 优先为提交审核时间，补充 workCreateTime

Made-with: Cursor

lesingle-creation-backend/src/main/java/com/lesingle/modules/pub/service/PublicContentReviewService.java

@@ -211,6 +211,7 @@ public class PublicContentReviewService {
         uw.eq(UgcWork::getId, id)
                 .set(UgcWork::getStatus, WorkPublishStatus.PENDING_REVIEW.getValue())
                 .set(UgcWork::getReviewTime, null)
+                .set(UgcWork::getSubmitReviewTime, LocalDateTime.now())
                 .set(UgcWork::getReviewerId, null)
                 .set(UgcWork::getReviewNote, null)
                 .set(UgcWork::getModifyTime, LocalDateTime.now());
@@ -316,11 +317,14 @@ public class PublicContentReviewService {
         } else if ("views".equals(sortBy)) {
             wrapper.orderByDesc(UgcWork::getViewCount);
         } else if ("oldest".equals(sortBy)) {
+            wrapper.orderByAsc(UgcWork::getSubmitReviewTime);
             wrapper.orderByAsc(UgcWork::getCreateTime);
         } else if ("latest".equals(sortBy) || !StringUtils.hasText(sortBy)) {
+            wrapper.orderByDesc(UgcWork::getSubmitReviewTime);
             wrapper.orderByDesc(UgcWork::getPublishTime);
             wrapper.orderByDesc(UgcWork::getCreateTime);
         } else {
+            wrapper.orderByDesc(UgcWork::getSubmitReviewTime);
             wrapper.orderByDesc(UgcWork::getCreateTime);
         }
     }
@@ -420,7 +424,10 @@ public class PublicContentReviewService {
         vo.put("reviewNote", work.getReviewNote());
         vo.put("reviewTime", work.getReviewTime());
         vo.put("publishTime", work.getPublishTime());
-        vo.put("createTime", work.getCreateTime());
+        // 审核台「创建时间」语义：优先展示提交审核时间（与 POST /public/works/{id}/publish 一致），非作品首次入库时间
+        vo.put("submitReviewTime", work.getSubmitReviewTime());
+        vo.put("workCreateTime", work.getCreateTime());
+        vo.put("createTime", work.getSubmitReviewTime() != null ? work.getSubmitReviewTime() : work.getCreateTime());
 
         // 补充作者信息（user 与 creator 同构，便于前端组件复用）
         if (work.getUserId() != null) {

lesingle-creation-backend/src/main/java/com/lesingle/modules/pub/service/PublicUserWorkService.java

@@ -196,6 +196,7 @@ public class PublicUserWorkService {
             throw new BusinessException(400, "当前状态不可发布");
         }
         work.setStatus(WorkPublishStatus.PENDING_REVIEW.getValue());
+        work.setSubmitReviewTime(LocalDateTime.now());
         work.setModifyTime(LocalDateTime.now());
         ugcWorkMapper.updateById(work);
     }
@@ -217,6 +218,7 @@ public class PublicUserWorkService {
         uw.eq(UgcWork::getId, id)
                 .set(UgcWork::getStatus, WorkPublishStatus.UNPUBLISHED.getValue())
                 .set(UgcWork::getReviewTime, null)
+                .set(UgcWork::getSubmitReviewTime, null)
                 .set(UgcWork::getReviewerId, null)
                 .set(UgcWork::getReviewNote, null)
                 .set(UgcWork::getModifyTime, LocalDateTime.now());

lesingle-creation-backend/src/main/java/com/lesingle/modules/ugc/entity/UgcWork.java

@@ -57,6 +57,10 @@ public class UgcWork implements Serializable {
     @TableField("review_time")
     private LocalDateTime reviewTime;
 
+    @Schema(description = "提交审核时间（用户发起上架审核，非作品创建时间）")
+    @TableField("submit_review_time")
+    private LocalDateTime submitReviewTime;
+
     @Schema(description = "审核人ID")
     @TableField("reviewer_id")
     private Long reviewerId;

lesingle-creation-backend/src/main/resources/db/migration/V21__ugc_work_submit_review_time.sql

@@ -0,0 +1,11 @@
+-- 用户发起「提交审核」时间（与作品 create_time 区分，供内容审核台列表/详情展示）
+ALTER TABLE t_ugc_work
+    ADD COLUMN submit_review_time DATETIME(3) NULL COMMENT '提交审核时间（用户 POST /public/works/{id}/publish）' AFTER review_time;
+
+-- 历史待审核数据：用 modify_time 近似提交时间（通常为最近一次提交审核时更新）
+UPDATE t_ugc_work
+SET submit_review_time = modify_time
+WHERE status = 'pending_review'
+  AND submit_review_time IS NULL;
+
+CREATE INDEX idx_ugc_work_submit_review ON t_ugc_work (submit_review_time);